Subject: Re: [xsl] RE: Does the count() function require access to the whole subtree? From: Wolfgang Laun <wolfgang.laun@xxxxxxxxx> Date: Mon, 13 Jan 2014 12:59:58 +0100 |
With growing insecurity ;-) My understanding is that count($x) may be called on the construction of a sequence which (the construction) is not streamable, and that calling count(...) on it does not make it streamable. Another thing: calling count(...) doesn't require to be positioned anywhere. -W On 13/01/2014, Costello, Roger L. <costello@xxxxxxxxx> wrote: > Thanks everyone, great discussion! > > From what you've said, it seems like the difference between inspection and > absorption is like the difference between inspecting a book's table of > contents versus diving into each chapter and absorbing its information. > > Here's my current understanding of inspection and absorption. Please let me > know if it is not correct or not clear. > > Inspection > > Inspection: operations that can be performed > while positioned at each item's start tag. Each > item can be treated as opaque. There is no need > to peek inside each item. > > These are inspection operations: count(), exists(), > name(). > > Consider a sequence of items. The function count() > can count each item in the sequence, without peeking > inside each item. > > Inspection operations are those that require only a > surface understanding of the items: we merely skim > the items. > > Absorption > > Absorption: operations that require going inside each > item. > > These are absorption operations: string(), data(), > xsl:value-of. > > Consider a sequence of items. The function string() > requires going inside each item in the sequence to > collect and concatenate all the values. > > Absorption operations are those that require a deep > understanding of the items: we must absorb all the > information in the items.
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